CVE-2025-59828: claude code Auth Bypass (CVSS 9.8)

Description

Claude Code is an agentic coding tool. Prior to Claude Code version 1.0.39, when using Claude Code with Yarn versions 2.0+, Yarn plugins are auto-executed when running yarn --version. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins would be executed prior to the user accepting the risks of working in an untrusted directory. Users running Yarn Classic were unaffected by this issue. This issue has been fixed in version 1.0.39. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-829 CWE-829

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
anthropic	claude_code	< 1.0.39

References

Other References

https://github.com/anthropics/claude-code/security/advisories/GHSA-2jjv-qf24-vfm4

Frequently Asked Questions

What is CVE-2025-59828? +

Claude Code is an agentic coding tool. Prior to Claude Code version 1.0.39, when using Claude Code with Yarn versions 2.0+, Yarn plugins are auto-executed when running yarn --version. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins would be executed prior to the user accepting the risks of working in an untrusted directory. Users running Yarn Classic were unaffected by this issue. This issue has been fixed in version 1.0.39. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-59828? +

CVE-2025-59828 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-59828? +

CVE-2025-59828 affects products from anthropic, specifically: claude_code. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59828? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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